Internal pipe threader and chaser



I 7 n. 11,1927. 1 H K UP INTERNAL PIPE THREADER AND CHASER Filed Nov 12 L925 Patented Jan. 11, 1927.

UNITEDNSTATES HANS K. HYRUP, OF LOS .ANGELES, CALIFORNIA.

' INTERNAL PIPE THREADER AND (ll-LASER;

Application filed November 12, 1925.

My invention relates to a tool or implement that is especially designed for cleaning and chasing the internally arranged threads of pipes, tubes, and-the like, and the principal objects of my invention are to generally improve upon and simplify the construction of the existing forms of internal thread cleaners and chasers; to provide a tool of the character referred to that may be easily and quickly adjusted so as to be used for cleaning and chasing the threads in pipes and tubes of different sizes; to provide a thread cleaner and chaser that is relatively simple in construction, capable of being easily and cheaply produced, and which will be very effective in performing its intended functions.

A further object of my invention is to provide a tool of the character referred to that has three points of bearing on the pipe or tube to which it is applied and two'of said bearing points being antifrictional in effect, thereby enabling the tool to be manuallyoperated with minimum efiort.

WVith the foregoing and other objects in view, my invention consists in certain novel features of construction and arrangement of parts that will hereinafter be more fully described and claimed and illustrated in the accompanying drawing, in which- 7 r Fig. 1 is an elevational view of an internal thread cleaner and chaser of my improved construction.

Fig. 2 is a top plan view of the tool with one of the handles thereof in horizontal section. 1 I

Fig. 3 is an enlarged cross sectiontaken on the line 3-3 of Fig. 2. I

Fig. 4: is an enlarged detail section taken on the line 1-4l of Fig. 1.

Fig. 5 is an enlarged cross section taken on the line 55 of Fig. 1.

Fig. 6 is a perspective view of a lock washer made use of in' my improved tool.

Referring by numerals to the accompam ing drawings, which illustrate a practical embodiment of my invention, 10 designates a substantially cylindrical handle, preferably cast or pressed from metal, and formed integral with said handle and projecting from one end thereof is an axially disposed plate 11, the end of which terminates in a shank 12. Formed integral with plate 11 adjacent'to the handle 10 is a pair of horizontally disposedparallel plates 13 that are spaceda sufficient distance apart for the Serial No. 68,557.

accommodation of a thread chasing bit 14,

the latter being formed of hardened metal and provided along its outer edge with teeth 15 that are adapted toengage the threads of the pipe or tube upon which the tool is used.

Obviously a number of these plates may be provided, each having diflerent sized teeth for engagement with corresponding lies parallel with plate 11 and said extension 19 terminates in an externally threaded tubular member 20 that surrounds shank l2.

Loosely arranged on the end of shank 12 and retained thereon by collars such as 21 is a tubular member 22 that functions as one .of the handles of the tool and said member is internally threaded for engagement with the externally threaded member 20. Obviously as, handle 22 is rotated its engagement with tubular member 20 will cause said parts to move in opposite directions, or onememher to move lengthwise independently of the other. Frame 18 is retained on bar 11 by a pin or screw such as 23 that is seated in'bar 11 and which passes through a longitudinally disposed slot 2 that is formed in the central portion of frame 19.

Formed in the upper and lower portions of the tr angular frame 18 are slots 25 that occupy angular positions of approximately 30 relative to a horizontal plane.

Formed integral with the outer face of plate 18 and immediately adjacent to the edges of these slots are ribs 26, in which are formed notches 2'7- and the latter being arranged in transversely disposed pairs. These pairs of notches are arranged at predeterm ned distances apart. Passing through the slots 25 are the end portions, of pins 28 on which are formed'collars such as 29 and arranged for rotation on the pins between said collars are anti-friction rollers 30 preferably of relatively soft metal such as brass.

The ends of the pins 28 that project I 7 through the slots 25 are reduced in diameter and threaded as designated by 31, and screwseated on said threaded portions are winged nuts such as 32.

Arranged on the reduced end portion of each pin beneath the winged nut 32 thereon is a washer 33 that is provided on its inner face with a diametrically arranged rib 84 and which rib is adapted to occupy any one of the pairs of notches 27.

The construction just described provides simple and efficient means for securely locking the anti-friction roller bearing pins 28 to the slotted portions of the frame 18 at predetermined points as is necessary for engagement of the rollers with the inner periphery of pipes of standard sizes.

In applying my improved thread cleaning and chasing tool to a pipe, winged nuts 32 are unscrewed a sufiicient distance to permit the roller carrying pins 28 to be moved lengthwise through the slots 25 until the rollers 30 on said pins engage the internal thread on the pipe at the same time that the teeth of the pin 14; engage with said threads. The winged nuts 32 are now tightened to lock the washers 33 in the notches 27 in which they are engaged and thus the tool is properly positioned in the end of the pipe With three bearing points thereon, two of which bearing points comprise the rollers 30.

To. tighten the engagement of the tool with the pipe and particularly the engagement of the teeth 15 of bit 14 in the threads ofthe pipe, handle 22 is slightly rotated so as toseffect a movement of bar 11 and frame 18 away from each other and thus the distances between the teeth of the bit and the bearing points of rollers 30 in the threads of the, pipe will be slightly increased, thereby accomplishing the desired firm bearing and engagement,

The operator now manually engages the handles 10 and 22 and rotates the tool in the end of the pipe and the engagement of the teeth of the bit with the threads in the end of said pipe will very quickly and effectively clean and chase the same.

The bitll' may be adjusted lengthwise between the plates 13 for engagement with threaded portions of different lengths.

Thus it will be seen that I have provided a thread cleaning and chasing tool that is relatively simple in construction, capable of being easily and cheaply produced, readily adjusted to pipes and tubes of different sizes and which tool, in addition to the bearing of the bit on the threaded portion of the tube, has two anti-friction bearings that engage the tube while the tool is in use, thereby enabling said tool to be manipulated with comparatively little effort on the part of the operator.

It will be understood that minor changes in the size, form and construction of the various parts of my improved internal thread cleaning and chasing tool may be made and substituted for those herein shown and described without departing from the spirit of my invention, the scope of which is set forth in the appended claims I claim as my invention:

1. In an internal pipe thread cleaner and chaser, a bar, a chasing bit carried thereby, a frame adjustably associated with said bar and provided with a pair of angularly disposed slots and anti-friction bearing roller carrying pins adjustalbl-y arranged in said slots.

2. In an internal pipe thread cleaner and chaser, a bar, achasing bit carried thereby, a frame adjustably associated with said bar and provided with a pair of angularly disposed slots, anti-friction bearing roller carrying pins adjustably arranged in said slots, a handle on the outer end of said bar and a handle on the outer portion of said frame.

3. In an internal thread cleaning and chasing tool, a pair of adjustably associated members, a chasing bit carried by one of said members, the other member being provided with a pair of slots thatconverge toward the chasing bit and anti-friction bearing rollers adjustably arranged in said slots. v V

4. In an internal thread cleaning and chasing tool, a pair of adjustably associated members, a chasing bit carried by one of said members, the other member being provided with a pair of slots that converge toward the chasing bit, anti-friction bearing rollers adjustably arranged in said slots and handles on the outer portions of said adjustably associated members.

5. In an internal thread cleaning and chasing tool, a pair of adjustably associated members, a chasing bit adjust-ably carried by one of said members and projecting laterally therefrom, the other member being provided with angularly disposed slots that converge toward the chasing bit, pins adjustably seated in said slots and projecting laterally on the same side of the tool with the bit and anti-friction rollers carried by said pins. 7

6. In an internal thread cleaning and chasing tool, a pair of adjustably associated members, a chasing bit. adjustably carried by one of said members and projecting laterally there-from, the other member being provided with angularly disposed slots that converge toward the chasing bit, pins adjustably seated in said slots and projecting laterally on the same side of the tool with the bit, anti-friction rollers carried by said pins and handles on the outer ends ofsaid adjustably associated members.

In testimony whereof I afliX my signature.

HANS K. HYRUP. 

